Abstract

FOREWORD BY DEANE B. JUDD

At the October, 1953, meeting of the OSA Committee on Uniform Color Scales there was reviewed the progress made since 1948 in experimental determinations of the rates of change of color perception with distance in the (Y,x,y) CIE color solid under various observing conditions. Similarly there was reviewed progress in devising more accurate formulas for the size of color differences perceptually evaluated. It was noted that these studies have supplied a basis for improvement in the spacing recommended in 1943 by the OSA Committee on the Spacing of the Munsell Colors. The committee voted to proceed with this adjustment of spacing and to undertake the preparation of a face-centered cubic (or regular rhombohedral) sampling of the adjusted color space in the form of color chips suitable for study by members of the committee. If the adjusted space is perceptually uniform, the rhombohedral sampling will result in an array of colors each of which, in the interior of the array, is surrounded by 12 nearest neighbors all differing from the central color by the same perceptual amount. On this account this array of colors is maximally convenient for a closing visual check of the adequacy of the experimental data used for adjusting the color space. As a first step toward production of such an array of colors in chip form, Dr. Wyszecki was asked to compute color specifications for a sampling of Munsell renotation space according to a rhombohedral space lattice of such unit size as to produce, with available colorants, about 500 colors. This paper gives the numerical results requested, together with a brief discussion of space lattices and their importance in studies of tridimensional color spacing.

Deane B. Judd, Chairman

OSA Committee on Uniform Color Scales

© 1954 Optical Society of America

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References

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  1. I. A. Balinkin, J. Opt. Soc. Am. 31, 461 (1941).
  2. C. E. Foss, Bull. Am. Ceram. Soc. 27, 43, 185 (1948).
  3. C. E. Foss, J. Soc. Motion Picture Engrs. 52 (February, 1949).
  4. D. Hilbert and S. Cohn-Vossen,Ans chauliche Geometric (Dover Publications, New York, 1944).
  5. C. E. Foss, J. Opt. Soc. Am. 37, 529 (1947).
  6. D. B. Judd, Color in Business, Science and Industry (John Wiley & Sons, Inc., New York, 1952).

1949 (1)

C. E. Foss, J. Soc. Motion Picture Engrs. 52 (February, 1949).

1948 (1)

C. E. Foss, Bull. Am. Ceram. Soc. 27, 43, 185 (1948).

1947 (1)

C. E. Foss, J. Opt. Soc. Am. 37, 529 (1947).

1941 (1)

I. A. Balinkin, J. Opt. Soc. Am. 31, 461 (1941).

Balinkin, I. A.

I. A. Balinkin, J. Opt. Soc. Am. 31, 461 (1941).

Cohn-Vossen, S.

D. Hilbert and S. Cohn-Vossen,Ans chauliche Geometric (Dover Publications, New York, 1944).

Foss, C. E.

C. E. Foss, J. Soc. Motion Picture Engrs. 52 (February, 1949).

C. E. Foss, Bull. Am. Ceram. Soc. 27, 43, 185 (1948).

C. E. Foss, J. Opt. Soc. Am. 37, 529 (1947).

Hilbert, D.

D. Hilbert and S. Cohn-Vossen,Ans chauliche Geometric (Dover Publications, New York, 1944).

Judd, D. B.

D. B. Judd, Color in Business, Science and Industry (John Wiley & Sons, Inc., New York, 1952).

Bull. Am. Ceram. Soc. (1)

C. E. Foss, Bull. Am. Ceram. Soc. 27, 43, 185 (1948).

J. Opt. Soc. Am. (2)

C. E. Foss, J. Opt. Soc. Am. 37, 529 (1947).

I. A. Balinkin, J. Opt. Soc. Am. 31, 461 (1941).

J. Soc. Motion Picture Engrs. (1)

C. E. Foss, J. Soc. Motion Picture Engrs. 52 (February, 1949).

Other (2)

D. Hilbert and S. Cohn-Vossen,Ans chauliche Geometric (Dover Publications, New York, 1944).

D. B. Judd, Color in Business, Science and Industry (John Wiley & Sons, Inc., New York, 1952).

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Figures (4)

F. 1–7
F. 1–7

The seven different possible ways of cutting the regular rhombohedral lattice shown on a single element of the cubo-octahedron lattice.

F. 8
F. 8

Parallel projection of the regular rhombohedral lattice perpendicular to any series of planes with triangle lattices.

F. 9
F. 9

Parallel projection of the regular rhombohedral lattice perpendicular to any series of planes with square lattices.

F. 10
F. 10

Formation of the cubo-octahedron from a cube and representation of a coordinate system for the regular rhombohedral lattice.

Tables (9)

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Table I Munsell value 1/.

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Table II Munsell value 2/.

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Table III Munsell value 3/.

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Table IV Munsell value 4/.

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Table V Munsell value 5/.

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Table VI Munsell value 6/.

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Table VII Munsell value 7/.

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Table VIII Munsell value 8/.

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Table IX Munsell value 9/.

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

Δ D = α Δ K ,
C = ( 3 p 2 + q 2 ) 1 2 .
φ ( H ) = arctan q p 3 .
H = φ 3.6 + 25
H = φ 3.6 75
C = [ 3 ( p + 2 3 δ V ) 2 + q 2 ] 1 2 ,
φ ( H ) = arctan q 3 ( p + 2 3 δ V ) .